Install

alternatives to minikube: k3s, microk8s.

minikube

sudo apt install apt-transport-https

wget https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
chmod +x minikube-linux-amd64
sudo mv minikube-linux-amd64 /usr/local/bin/minikube

kubectl

curl -LO https://storage.googleapis.com/kubernetes-release/release/`curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt`/bin/linux/amd64/kubectl
chmod +x ./kubectl
sudo mv ./kubectl /usr/local/bin/kubectl

kubectl config

stackoverflow

kubectl config view --flatten # output can be appended to .kube/config

kubectl config view
kubectl config use-context minikube

Basic Commands

minikube start
kubectl cluster-info
kubectl get nodes
kubectl get pods --all-namespaces
kubectl get events
minikube ssh
minikube dashboard
minikube dashboard --url

minikube stop
minikube delete

find out IP of minikube host:

minikube ssh "route -n | grep ^0.0.0.0 | awk '{ print \$2 }'"

deploy a container

kubectl create deployment hello-node --image=gcr.io/hello-minikube-zero-install/hello-node
kubectl get deployments
kubectl get pods

expose it as service service

kubectl expose deployment hello-node --type=LoadBalancer --port=8080 
kubectl get services
kubectl logs <POD-NAME>

minikube service hello-node

Create a deployment with a specific pull-policy

eval $(minikube docker-env)
make docker-run # create the docker image

minikube ssh
docker images -a # verify the docker image exists

kubectl create deployment ppc --image="ppc" -o yaml --dry-run   > pcc.yaml  # set spec.template.spec.containers.imagePullPolicy: Never
kubectl apply -f pcc.yaml

kubectl expose deployment ppc --type=LoadBalancer --port=8000

replicas

kubectl run test-nginx --image=nginx --replicas=2 --port=80 --expose --service-overrides='{"spec": {"type" : "LoadBalancer"}}'
kubectl exec -ti test-nginx-959dbd6b6-6m8x7 -- bash

kubectl run catnip --image=uzak/catnip:latest --port=8080
kubectl expose deployment catnip --type="LoadBalancer"
kubectl get services
kubectl scale deployment catnip --replicas=4

helm

From article:

helm is composed of two parts: client (Helm) and server (Tiller) helm chat contains at least 1) a description of the package (chart.yml), one or more templates examples on google cloud deployment are omitted in this file ...

kubectl get nodes
kubectl describe node minikube
brew install kubernetes-helm
helm init
kubectl --namespace kube-system get pods | grep tiller

export POD_NAME=$(kubectl get pods --namespace default -l "app=redis" -o jsonpath="{.items[0].metadata.name}")
kubectl port-forward --namespace default $POD_NAME 6379:6379
redis-cli -h 127.0.0.1 -p 6379 -a $REDIS_PASSWORD

helm install stable/redis --set serviceType=NodePort
helm install stable/mongodb --set serviceType=NodePort
helm install stable/wordpress --set mariadb.image=bitnami/mariadb:10.1.21-r0 --set serviceType=NodePort

kubectl proxy
minikube dashboard
kubectl desribe po # pods

helm ls
helm del --purge $(helm ls -q)

Links:

https://docs.bitnami.com/kubernetes/how-to/